Ok,I can tell you without even a shadow of doubt who was responsible for this accident. It was the West Point cadet because he or SHE was the person in charge,and it was the person in charge that gave the order to drive into the water.
I wonder who his (or more likely "her") daddy was? The Army would ONLY cover something like this up if the officer in charge has a family with political connections in either the Army,the government,or both. Given how vague they are on the subject,I am guessing the OIC was a female.